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This paper proposes a fragile watermarking algorithm named compression watermarking algorithm (CWA) which provides compression and authentication functions to apply in MJPEG of video surveillance system. The watermark information is embedded into every 8 times 8 block in the coefficient domain in encoding process and extracted watermark from each 8 times 8 block in the coefficient domain in decoding...
TMS320DM642 is a special high-speed DSP processor chip developed by the Texas Instruments for the digital multimedia application. In the paper, the performance features of the TMS320DM642 chip is introduced and the digital frame extractor based on the TMS320DM642 is designed. The video input module and output module, the hard disk module, the network module of the digital extractor are configured...
An adapt flexible macroblock ordering strategy based on unequal protection scheme is presented for video transcoding. The key point of our scheme is selecting the important macroblocks which belong to a separate slice group under prior protection in transmission. The judgement of the importance of the macroblocks is based on the differences of the DCT coefficients of neighbouring subblocks in a macroblock...
We present in this paper a simulation-based comparison of two single-rate multicast congestion control schemes (TFMCC and PGMCC) against our proposed adaptive smooth multicast protocol (ASMP). ASMP consists of a single-rate multicast congestion control, which takes advantage of RTCP sender (SR) and receiver reports (RR). The innovation in ASMP lays in the "smooth" transmission rate, which...
This paper proposes a novel fine granularity scalability coding framework with hybrid open-close loop structures (KRPS-FGS) based on key reference picture. The open-structure with single prediction loop is exploited to code non-key frames to achieve the best coding efficiency, which uses the highest quality image as the reference picture for both base and enhancement layer. To control drift, some...
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